i kind of think it's better that we don't know. if people knew what happened after death, they would either give up/become apathetic if it was just nothingness, or if there was some otherworld, try to manipulate the dead for their own personal gain. we can't just leave things alone, always got to fuck it up somehow.
but on the other hand, i don't think when we die we just disappear but at the same time i don't think everyone continues on/reincarnates. i have my suspicions that you get a "choice" what happens to you and sometimes i think some people just choose not to reincarnate. personally, i've had some weird experiences like dreams that suggest maybe i've lived more than one life, and i've dreamed of people i've known coming to see me again to let me know they are still "alive", but at the same time…i just don't know, so i try not to worry about it too much.